<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span
          v-if="item.redirect==='noRedirect'||index==levelList.length-1"
          class="no-redirect"
        >{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import { mapGetters } from 'vuex'
const pathToRegexp = require('path-to-regexp')
export default {
  data () {
    return {
      levelList: null
    }
  },
  computed: {
    ...mapGetters([
      'newRoutes'
    ])
  },
  watch: {
    $route () {
      this.getBreadcrumb()
    }
  },
  created () {
    this.getBreadcrumb()
  },
  methods: {
    getBreadcrumb () {
      let matched = this.$route.matched.filter(item => item.meta && item.meta.title)
      const thisRouter = matched[matched.length - 1]
      const first = matched[0]

      if (!this.isDashboard(first)) {
        matched = [{ path: '/home', meta: { title: '首页' } }].concat(matched)
      }
      if (thisRouter.name.includes('Detail')) {
        const name = this.$utils.getStrBefore(thisRouter.name, 'Detail')
        const parent = this.$utils.treeFind(this.newRoutes, (item) => {
          return item.name === name
        })
        const list = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
        list.splice((matched.length - 1), 0, parent)
        this.levelList = list
      } else {
        this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
      }
    },
    isDashboard (route) {
      const name = route && route.name
      if (!name) {
        return false
      }
      return name.trim().toLocaleLowerCase() === 'home'.toLocaleLowerCase()
    },
    pathCompile (path) {
      const { params } = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink (item) {
      const { redirect, path, link } = item
      if (path === '/home') {
        this.$router.push(path)
        return
      }
      const thisRouter = this.$utils.treeFind(this.newRoutes, (item) => {
        return item.name === this.$route.name
      })
      if (redirect && redirect !== thisRouter.link) { // 当前页面不等于重定向页面
        this.$router.push(redirect)
      } else {
        this.$router.push(link)
      }
    }
  }
}
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
